Display apparatus



14, 1925 5 Sheets-Sheet 2 L'. .B c

Jan. 8, 1929.

R. M. CRAIG DISPLAY APPAmwUs Filed Aug.

R. M. CRAIG' DISPLAY APPARATUS Filed Aug. 1925 3 Sheets-Sheet 5 e f' f.ff/F f @615- G x'i/ 7 .H

Patented' '8, .1929.\ l.

s .PATENT O CRAIG, 0F SA'N ANTONIQQTEXAS.

- DISPLAY iirramrius.4

applic-aaai iii-ea 'August' 14, 1925. serii' No. 50,830.

This invention relates to Aa'inovel: method' of and means for'displaying advertising mat-y ter and the like in a manner to attractandA holdthe attention of the'observer, and is designed as animprovement over the methods constitutingv the subject matter of myprior patents, namely, advertising sign, No. 1,276,- 494, issuedAugust'20, 1918,'"and animated sign, No. 1,428,007, issued September 19, 1922.

As was pointed out in vthe specifications of my said prior patents, itis a well recognized Y fact that the controlling factors in determiningthe value of an advertising display sign as measured by its power toattract and hold where advertising matter is v such a manner that all ofthese factors are' the attention, are light, color and animation, aswell vas the factor of mystification, and displayed in present,thedisplay will attract and hold the attention of the observer to a fargreater dcgree than where one or more of these factors are not presentAttempts have been made to bring about these desirable results bytheerection of huge signs on which images are 'displayed 'through acarefully selected ar-F rangement of'an` enormous number of electric'light bulbs of different colors, but the cost of such signs isprohibitive and they do not truly portray motion -oi' change inappearance of the matter displayed. In accordance With my previouslyd-isclosed methods, figures are depicted, by the use of pigm`ents,"ordyes or links of complementary colors, in superposed relation, upon asign board or other display surface having a substantially White background, and this surface is alternately illuminated'fby special lightraysr of the correspondin complementary colors, so that if an imageisgportra'yed in two di'erent positions,

Ias a simp e example, one position being repre# sented in red and theother in blue green, and

produced. In painting the images, underr` the display surface isfiooded'with red light, the image in'red Will be invisible tothe eye,and theimage in blue green'will appear substantially blacln'and,conversely, ift-he display surface'is flooded with a blue green light,the blue green image -Willbe invisible and the image in red will appearsubstantially black on a white background, so that, diie to persistenceof vision, the effect of animation is these .methods itwas foundnecessary to use y what are termed transparent-colors, due-to v the factthat the images more or less 'overlapped, the color last applied beingtransparent, and While, during night display, the

sitions of the images,

'signwouldpossess great value Vas an advertising medium, yet it was tosome extent lacking in value as a daylight sign, due to the 'overlappingof the images.

FFICE.- I,

where they can be em- .p.loyed, as they enhance the value of the sign asa daylight sign. Furthermore, I have found that inthe case of outdoordisplays it is essential, from a practical and commercial point of view,that opaque pigments be employed Whichare not affected by the elementsor sun rays so that, for example, fugitive pigments are Whollyunsuitable for the purpose.' Therefore, it'is one of the objects of thepresent invention to disclose a method of and means for producing theelect of animation er change in position dr condition of one or moredisplayed images, in `such manner that the display surface Will-possessas great value as any ordinary daylight sign as Well as an animatedmedium for display at night, and in this connection the invention.contemplates the complete separation of the displayed images and theirdisplay to the observer in a more eliecti-ve manner than is possibleWhere they are overlapped. y

It will be seen that in my prior patented methods, the different imagesor different poor other different matters, were depicted incomplementary colors on the display surface, and while, under thepresentl method this is 'likewise contemplated, except that the imagesare in most instances completely separated or different'matters to bedisplayed are completel separatedithe present invention contemp' atesand has as another object ,the display of di'erent matters or, di'erentimages or different positions of the same images, in a single pigmentcolor under spectral lightrays of such colors as will effect theappearance of change or' animation, thereby of employingcomplementarycolors upon the display surface, and this is'of vantage Where, forexample,

markpeculiar to the commodity being advertised and Where an essentialfeatureof the i trademark is a distinctive obviating i the necessityparticular ad I the advertising matter embraces a representation of atrade.

where .complementarypigment colors'are employed in depicting .images ordifferent matters upon a light background, such for example as 'red andblue or green, diliiculty Ais experienced at times, in completelyobliterating 'the matter displayed in blue or green, whereas the matiter displayed in red, orange or yellow can be readily completelyobliterated under proper conditions of illumination of the white orlight colored display surface. Therefore, it is another important ob'ectof the present 'invention to evolve a met od whereby, wherecomplementary colors are employed such as red and blue or blue green, orgreen, the matter displayed in the latter colors may be completelyobliterated at the time thematter in .red is displayed, and, in thisconnection, the

invention further contemplates a medium whereby the matter displayed inblue, vblue green, or green, will, under the conditions of display, bebrought out with brilliancy to an extent which has been heretofore foundim ractical.

further object of the invention is to evolve a method of display inwhich advantage is taken of the characteristics of colors i 'for thebackground of the display surface in a manner to permit of a vastvariety of' v combinations of pigment colors and a. display thereofunder selected spectral colors iu a manner to produce novel displayeffects. In the accompanying drawings:

Figure 1 is `a schematic view illustrating one application of theIprinciples of the -present invention wherein different matters aredepicted in a common pi ent color on different neutral backgroun s andare displayed by different spectral colors to produce lthe eifect oftransformation.

colors.

Figure 4 is a schematic view illustrating another .application of theprinciples of the invention.

Figure 5 is a similar view illustrating af further application of theprinciples of the invention in which thevefect of animation is to beproduced and wherein a portionof the display matter is common to twopositions of another portion of the display matter.

Figure 6 is a schematic view illustrating still another application ofthe principles of the invention, wherein parts of represent ed imagesare overlap ed and wherein the images are represente und. n thedescription which is to ollow, reference will be made to pigment colorsand by this term is meant colored pigments orthe spectra-l colors b v incomplementary pi ent colors on a neutral backfgro colors in which theimages are represented on the display surface. Where reference is madeto spectral colors such reference applies to colors of the spectrum asrepresented by colored light rays. Reference will also be made toneutral colors, which I employ as backgrounds, and by neutral colors Imean such as do not materially change under the which the images aredisplayed or, in ot er words, those which display no decidedcolor-characteristics such as relate toV primary colors, and remain ofabout the same apparent densit under complementary or primary :colorelight rays.

In Figure l -of the drawings, illustrating one application of theprinciples of the invention, the numeral '1 indica-tes in general adisplay surface which may be' a signboard or any other surface foundsuitable for the purpose. In carrying out the invention, substantiallyone-half of the area of "the board is painted to provide a neutralbackgroundQ which is light in color and( painted white light neutralcolor, and the other half of the lead or zinc white or any otherappropriate` l area painted to provide 'a dark background 'of a neutralcolor indicated by the numeral 3. This background 3 may be black or avery' dark gray or any other dark neutral color found suitable for'usein this articular embodiment of the invention. pon the background 2there is painted, in this instance in red, the representatie of a femalein street attire, and upon the Ibackground 3 there is the representation5 of a female in bathing attire, also painted in red. The numeral 6indicates sources of red light rays which may be'red electric lightbulbs and which are so arranged with relation to the display surface 1as a whole that the' entire surface maybe dicates blue light ulbs or.othersources of blue light rays which are likewise arranged so that theentire display surface maybe flooded with blue, blueeen, or green light.In this embodiment we ave the combination of a single pigment color'andtwo complelflooded with red light, and the numeral 7 1nmentary spectralcolors. In the operation of the sign, and in accordance with theprinciples of color absorption, when the display surface is flooded withblue light, the image 5 will be obliterated and the entire area of thesurface which bears the background 3 will appear substantially black,including, of course, the representation of the image 5. At this time,the image 4 will be visible and will appear substantially black on asubstantially white background. On the other hand, when the displaysurface is flooded with red light, the image 4 will be obliterated as itis likewise painted in red, but the image 5 will appear against a blackbackground and, due to the contrast between the dull 'black backgroundstand out vividly. It wi l be observedthat in this application of6J theprinciples ofthe invention, both images are of the same color and whilereference has been made to a representation of the images in redororange, it

6 will be understood that various'other pigment colors may be employed,.such for example as ,l blue or green. For example, if the two imagesshould be painted in emerald green or blue green, then, when the displaysurface is flooded with red light, the image will appear substantiallyblack against a substan-4 tially white background and the image' will beobliterated and, conversely, when the dis.

play surface is flooded' by blue light rays, the l5 image 4: will beobliterated and the image 5 will stand out vividly as in the precedingexample. It will be understood, of course, that pigment colorsother-than the primary colors may .be employed, the spectral colors withwhich the display surface is flooded .being `Varied accordingly. It willbe evident thatv in this adaptation of the principles of the invention,a sign displayed in accordance therewith will possess great value `as adaylight sign inasmuch as the images are not over-V `4o 5 this latterinstance, -the image willl stand out vividly a ainst a dark background'.

It will e understoodthat the concrete ex-'i ample illustrated in Figure1 of the drawings -and above described, is merely offered as an 451exemplification of one practical embodiment ofV the principles of theinvention in a signboard and thatthe invention is in noway I limited tothe particular color Icombinations' referred to nor is it limited to anyparticular 5o arrangement of the contrasting backgrounds- 2 and' 3,nor-to, thenumber of 'suchbackgrounds for various portions of thedisplay surface might be palnted to afford abackground-relativelyhghtintint and'other portions may be painted to afford 'a background dark incolor, withou regard to the area covl v ered bythe'backg l nds orfthe`relative arrangement ofthe backgrounds, so that thereA arepracticallyunlimited opportunities for 60, `an advertiser to d-isplayhis skill inarrang-l ing advertising matter upon the display sur- `face.\` .y nInthe embodiment illustrated in Figure 2 of the drawings, the numeral 8indicates in "i5 Ageneral the display surface on which there issubstantially black,"and the images 14, 15' and 'dark background.-ooding the display su' painted a background9i'of a lit-neutral colorand a background 10 of a ark neutral color. At this point, litmay vbestated that the extremes of neutral colors are white and black and thatthere are many Vcolor tintso which may be employed fora light backgroundand many dark tints which may be employed for a dark background,. sothat' in none of the embodiments of the invention are thebackgroundsrestricted to any particular neutral color, the colors beingselected in accordance with thev .pigment colors to be :Y employed inrepresenting the different images and the judgment ofthe one'supervising the arrangement and painting of ther 80 Y advertising orother matter to be displayed.

In the said Figure 2, and upon the backgroundv 9, there-arerepresented,for example,

two blocks standing approximately on end and indicated .by the numeral11, these blocks S5 being represented in red, for example, and Figures12 and 13 may likewise be represented upon the said background, in red,and the former apparently supporting the blocks and the latter standingupon the upper one of the blocks. Similar blocks 14 are represented ingreen upon the background 10, and Figures 15 and 16 similar to theFigures 12 and 18, are likewise lrepresentedA in green upon thisbackground. Red light bulbs 17 or any othersource of red spectral' lightrays, and green, blue, or bluish green bulbs 18, or other sources ofspectral rays of similar color, are so arranged with respect to thedisplay surface that the surface may be successively Hooded with thecomplementary or contrasting spectral colors. In this embodi- 'ment ofthe'invention, when the display surfaceis Hooded with red light, the imaes upon the background 9 will be obliterate as will also the imagesupon. the background 10, but when the surface is looded with blue flight or blue` green light, .thejimaves 11, 12

and 13 upon the background 9 will appear 16 upon the backgroundlO will'stand-'out substantially white, by contrast with lthe Thlls .Y bysuccessively ce with spectral..l light rays of Ycomplementan'v orcontrasting colors, the' matter represented vin pigment colors upon the.surface willbe caused to appearand disap can," It willb'e unerstood,vof` course, that in the embodiment just described, .the images11, 12A and 1,3 upon the background 9 may .be representedin-green andtheimages 14, 1.5 and t 16 upon the background 10 may be represented in redso that-both sets vofimages will appear under the 'red light but bothvbe obliterated under bluelight.

In the embodiment shown iii-Figure v3 ef the-drawings, the displaysurface, whlch 1s indicatedfby the numeral 19, may have Pa neutralDQment annlierl thnmfn fn nrnviln 12ol I l' a dark neutral Vbackgroundindicated by by blue light rays the numeral 20, and such pi ment mightbe tobacco brown or Indian re or an of the other dark neutral colors. Inthis instance two figures, indicated by the numerals 21 an 22, may bepainted upon the display surface, the one indicated by the numeral 21lbeing, for example, re' resented in red and the one indicated by t e'numeral 22being represented in green. The two figures ma as an example,be representative of a c own in a jumping posture, although, of course,this disclosure is. to merely illustrate the application of theprinciples of the invention.

`Red light bulbs 23, andblue lightbulbs 24,

or other sources of red and blue spectral light, are arranged so thatthe display surface may be iooded with red and blue light rays,alternately, and when the surface is flooded with red light rays, theimage 21 will stand out vividly, but the image 22 will be obliterated.In like manner, when the surface is flooded the image 22 will 4stand outvividly and the image 21 will be obliterated so that as the sources oflight are alternately flashed on, the ap earance, will be that of theclown-jumping rom one side to the other'of the display surface.

In the embodiment just described, the images are representedupon a darkneutral backgfound, but it will be understood, without rtherillustration,that they might be represented upon a white backgroundor aneutral back round, in which event the image 21 woul appear and theimage 22 disappear under blue light rays, and the image 22 would appearand the image, 21 disappear under red light rays, which is the converseof what takes place in the embodiment mentioned.

Figure 4 of tion to a display surface havin a number of variouslyarranged neutral bac grounds and various images depicted thereon to bedisplayed under spectral rays 'of different colors,

this figure is intended to illustrate the fact that a dis lay surfacemay, in accordance with the invention, be divided up into a number ofvariously arranged light and dark background areas so that manvcoinbinations of images or matters to e displayed maybe readilyeffected. In the spe-i the numeral 25 indicates in surface and the samein the nature of a sign cific illustration, general the displa may, forexamp e,

board to advertise the business of a real es.-

tate a ent or a contractor and builder, Certain o the background areas,indicated by the numeral 26, may be of a light neutral co or; others,indicated by the numeral 27 may be of a dark neutral cplor, and others,cated at 27', of distinctive pigment colors. various styles of houses,bungalows, and other building 'structures' may `by the use of a red pi-structures represented in thes aces or areas 27 may be painted, one inre as indicated ciples being emplo the drawings illustrates theAapplication of the principles of the inven` position, the

-indibe represented in the areas 26, as indicated by the numeral 28, ingreen pigment, the area 29 ina .dark neutral coloi` on a red background,and another, indicated by the numeral 28', may be represented ent. Thebuilding by the numeral 30, and the other 30 in green.

The numeral 31 indicates sources of red spectral light and the numeral32 indicates sources of green spectral li ht. B reference to Figure 4,it will be un erstoo that when the displaysurface is io'oded with redlight rays, the re resentations 28, 29 and 30 willap ar and terepresentations 28 and 30 w1 be obliterated and, on the other hand, whenthe surface is flooded with green rays, the representations 28', 29 and30 will alone appear and the representations 28 and 30' will beobliterated. While this. figure, as well as Figures 1 and 2, previouslydescribed,.repre sent a display surface divided by well de:

nol

or merged and be ofa more 0r less irregular outline, dependin of course,upon the nature of the advertising matter 'or other mat ter to bedisplayed. It will be evident at this point that in this embodiment ofthe invention each of the areas constitutes in effect an J individualdisplay surface, different prin-` ed in representing the matters to bedisp ayed upon the several areas and that yet the entire display surfaceconstitutes a composite of all of the areas and is alternately displayedunder light rays having different color characteristics. It will beevident, therefore, that the ciples resorted to in' arrangin ordepicting the display matter,.in this em diment, may be employed in thelredplgesentation of more complex subjects, all played on a single ace.

Figure 5 of the drawings illustrates an embodiment in which the effectof motion is produced and in which the apparently mov-` ingpparts arerepresented upon backgrounds of diierent colors. In this embodiment,the.

` p hintfed thereon and red background areas 435.

e representation in this re is that of a see-saw or a tester-totterwhich, in one position of its movement is illustrated in plain white, asindicated by the numeral 36, the see-saw vin this position beingYrepresented upon the red background 35. In its other see-saw orteeter-totteris represented as at 37 in red upon 'thefdark neutralbackgrounds 84. The stand uponwhich supported for rocking move- Ament isrepresented in white, as indicated by the see-saw is the numeral 38, andis located between two of the background areas 34 and 35, it beingobserved that the areas 34 are diagonally opositely located and 'thatthe areas 35 are ikewise diagonally oppositely'located. Red light bulbs39 and lblue bulbs 40, or other equivalent sources of spectral Acoloredlightrays are so arranged with relation to the display surface that thesame may be Hooded erably be with red rays or with blue rays, and itwill be understood that when the surface is flood ed with redlight-raysthe image 36 will be obliteratedfbut the image 37 will 'stand outsubstantiall white agamst` the background' areas- 34. lihen the surfaceis Hooded withl blue light rays, the image 37 willbe obliterated and theimage 36 will stand out substan-v tially white against the thenapparently black background 35. Under both conditions,

the support or pedestal 38' will be visible. -It

Lto a display surface on which images are partially overlapped .orsuperimposed and in'this figure the display surface will prefanted toprovide neutral areas 41 and 42 which will be, in the illustratedembodiment, respectively dark Aand light'in color. As an example of thisadaptation of the rinciples'of'the invention, one or more worcomprising. 'an advertisement, arev painted upon the ackground areas,each letter of each word being represented in two shapes andsizes, andportions of the two .representations of each. letter being' overlapped., Thus, for example, the letters of o ne word are painted uponthebac ound 41 in red, for example, as. indicated y the numeral 43, inone size and style of letter,

and theV corresponding letter in another' size "ter, andthe corres andstyle be printed in green, as indicated-bythe numeral 444. Theletters ofan- 5o other word are' printed, for exam le, u on the 'background 42, ingreen, as in icate by the numeral-43', in one size and style of let-7nding letter in another size and le will painted'in red as indi-A catedby t e'numeral 44.- Where any por-"- tionsof the two letterrepresentations 43,v and 44overla'p, the overlappin portions, in.-4dicated by the numeral 45, will represented in white, inasmuch as theseletter re resen-` tations are on a black or dark neutra backf ground. Inalike manner,`where any portions ofthe letter representations 43 v and44' overla ,the will appear4 in .black inasmuch ast ese. etterrepresentations are o n a white or light` neutral'background. Thenumeral 46 indicates-a source of redli ht rays. and the numeral`47 avsource of' b ue light rays. Itwill nowibe apparent that whenthe displaysurface is illuminated byl thered light rays, the letterYrepresentations 44 will be obliterated and the letter representationsS43 and the overlapped' portions will stand out vividly against a blackor dark background. At this time, the letter:

representations 44', which arej in red, will be obliterated as theyappear on the white or light backgroundarea 4 2, and the letterArepresentations-43 together with the verlapping portions l45"`whichllatter are in black, will both 4appear black against theV whitebackground. `On the other hand, when thev display surface is Hooded withblue light,

the representations 43 will be obliterated and the representations 44together with'the overlapping portions "45, will stand out vividlyagainst a black background and, at the same time, the representations;43 will be -obliterated and the representations 44"and the blackoverlappin portions 45 will stand out substantiallylack against a Whitebackground. 'l'hus, if the letter representations 43 are, as showninthe-drawings, relathere will be an appearance o f expansion andcontraction of the letters 'as th`e board or other displa withvred an:blue light rays. This applicacourse, not limited to the display ofletters,

for various images mi ht bezarran -in vtively short and broad,- and thevletter repre- Y sentations 44 are relatively tall and narrow,`

:surface is4 alternately Hooded *tion-of the principles of the invention1s, of

more or less overlappe relation an =simi.l

larly` layed. Furthermore, this applica tion of t e principles oftheinvention 1s not ,limitedV to the use oz contrasting backgrounds, vforlight neutral or dark neutral backgrounds might be employed.

It win be evident-,rather while referencer@ been made' to ,the .use ofpigment colors in 'the representation -'of' the images or otherv matter.to be dis layed,'t he maybe re re' sented by colore hthograp uc.pr1nts,' yes,

opaque. or transparent Voil or water .colors,

etc., and the invention :maybe employed for advertising, theatrical,amusement, educational and other purposes. 1

In the several'embodimentsof the ixivention illustrated fand described,the rinciples have been-adapted primarilyto a vertlslngdisplays, but itwill be .understood that this is' merely v representative -of oneapplication of the princlples of vthe invention and that I l theprinciples may be employed in color dlsl plays for any purposeswhatsoever such .forv

plays, educationaldisplays, walls, cabarets, y

example as scenic elects, amusement 'dis- It of course, essential employl for efectin illumination of the display surface, in eac of theillustrated embodiments of the invention, which-means will operateautomatically, and `inasmuch as there are inanyliashing devices whichmay be employed for this purpose, I have illustrated in connection witheach figure a flasher indicated as a Whole by the reference letter A,which may be a rotary disc of insulating material having concentricseries of contact strips B and C upon its face in circuit with a shaft Dwhich supports the disc for rotation, wires E serving to electricallyconnect the said `contact strips and the shaft, and a conductor wire Fbeing led from the shaft to one side of a source of current supplyindicated by the numeral G. A conductor wire H leads from the other sideof the source of current su ply and is connected to the sockets for allo the electric light bulbs regardless of their distinctive colors.vBrushes I and J are arranged to coact respectively-.with the contactstrips B and C, and conductor @wires K and L are led respectively fromthe bruslies I and J and are connected, one with the other terminal ofeach socket for a light bulb of one color and the other with the otherterminal of the socket for each light bulb of the other color. Thecontact strips B and C are arranged in staggered relation so that thecircuit will be successively alternately closed through the bulbs of thetwo distinctive colors.

Having thus described the invention, what I claim is: I

1. Display apparatus comprising a displa surface having contracting backoun areas of neutral colors, matters to 'dis- .played represented uponsaid areas in 'a distinctive pigment color, and means for displayingsaid surface successively in the presence of contrasting spectral colorsone of which corresponds substantially to the pig ment'color in whichthe said matters to displxliyed are represented Y 2. is layI apparatuscom risinga'display surface aving backgroun areas of contrasting neutralcolors, the areas bearing' matters to be displayed and represented. indistinctive contrasting igment colors,` and meansfor displaying saidsurface successively in the presence of contrastin spectral colors eachof which corresponds su antislly to a respective one of the pigmentcolors.

3. Display apparatus comprising a ,display sur ace having contrastingbac grounds of neutral colors,.each background area bearing matter to bedisplayed, the matter appearing in one form on ne area and in another.form in another area and the said matter being representedin a singledistinctive pigment color, and means or displayin said surfacesuccessively inthe presence ocontrasting s ral colors one of whichcorresponds su tially to the' pigment color and,

the-other of which is complimentary to the pigment color.

4. Means for displaying the effect of change in appearance ofrepresented matters com-V prising a display surface having a backoundrepresented .in neutral colors and having thereon the matters to bedisplayed represented in a pigment and which pigment representationshave no spectral color dilference, and means for displaying said surfacesuccessively in the presence of light rays having different colorcharacteristics and one corresponding substantially to the pigment inwhich the matters are represente l 5. Means for displaying the effect ofchange in appearance of represented matters comprisin a display surfacehaving `a, backgroun represented in neutral colors and having thereonthe matters to be displayed repf resented in a pigment and which pigmentrepresentations have no spectral color difference, and means fordisplaying said surface directl to the eye successively in the presenceof l1 ht rays oodin the entire surface and w ich rays have ifl'erentcolor characteristics, one corresponding substantially to the piigmentin which the matters are represente change in appearance of representedmatters comprising a display surface having contrasting background areasof neutral colors, matters to be'displayed represented upon saidrepresentations have no spectral color diference, and means forsuccessivel instantaneousl flooding the display sur ace at noncoinci entperiods with light rays having different color characteristics.

ti. Means'for displaying the effect of 8. Means for displaying theeffect of' change in appearance of represented matters comprising adisplay surface havin a back-A f ound represented in neutral co ors andaving thereon the matters to be displayed `represented ina pigment andwhich pigment reresentations have no visible spectral color di erence,and means for successively instantaneously loodin the display surface atnon-coincident perio s with light rays having different colorcharacteristics and one corre- -i sponding substantially to the pigmentin which the matters are vrepresente l ,9.Means for displaying Athe'eect of changein appearance of represented matters comprising a displaysurface having a backgroundfrepresented in contrasting neutral isncolors, and having thereonv the matters to be displayedrepresented inpigment and which matter. representations have no visible specl traldifference, and means for displaying said surface at successive periodsunder light rays tations of matters to be displayed and whichrepresentations' are of a distinctive color, and means fordisplayingsaid surface selectively in the presence of light rays having differentcolor characteristics such as to obliterate one sentation visible.

11`.l Means for displaying t-he eect of ani- `representation and renderthe other repremation of separated limages'comprising a display surfacehaving a background represented in contrasting neutral colors and hav'ing thereon the matters to be displayed represented in a singledistinctive pigment color, and meansfor displaying said surface atsuccessive periods under light rays of a character to obliterate onerepresentation and render the other representationvisible.

In testimony whereof I aiHX my signature.'

RICHARD M. CRAIG. [L 5.]

